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The blood vessels to the brain are primarily in the Meninges, consisting of several layers with the Pia layer being primarily capillaries, and the arachnoid space being full of smaller vessels.
Here are some good reference articles.
http://www.csuchico.edu/~pmccaffrey//syllabi/CMSD%20320/362unit3.html
http://homepages.nyu.edu/~eh597/Meninges.htm

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